Icon for a portion of a display screen



FIG. 1 is a front view of an icon for a portion of a display screen showing our new design;

FIG. 2 is a front view of a second embodiment of an icon for a portion of a display screen showing our new design; and,

FIG. 3 is a front view of a third embodiment of an icon for a portion of a display screen showing our new design.

The broken line showing of the display screen in all views, and the portion of the icon in FIG. 3 forms no part of the claimed design. 

The ornamental design for an icon for a portion of a display screen, as shown and described. 